ITEM STANDARD TEST

CHARACTERS  WHITE OR ALMOST WHITE CRYSTALS

CRYSTALLINES POWDER PASSED

IDENTIFICATION                     POSITIVE REACTION                POSITIVE 

MELTING POINT                      ABOUT 190°C                     190.6 °C

PH                                 2.1-2.6                          2.10

COPPER                             ≤5PPM                           ＜5PPM

HEAVY METALS                       ≤10PPM                          ＜10PPM

MERCURY                            ≤1PPM                           ＜1PPM

LEAD                               ＜2PPM                           ＜2PPM

ARSENIC                            ＜3PPM                           ＜3PPM

CADMIUM                            ＜1PPM                           ＜1PPM

OXALIC ACID                        ≤0.2%                           ＜0.2%

IRON                               ≤2PPM                           ＜2PPM

LOSS OF DRYING                     ≤0.4%                           0.15%

SULPHATE ASH (RESIDUE ON IGNITION) ≤0.1%                           ＜0.1%

SPECIFIC OPTICAL ROTATION          +20.5°～+21.5°                 +20.69°

MESH                               40-100  MESH                     PASS 

RESIDUAL SOLVENTS              MENTHANOL:NMT3000PPM                ＜3000PPM

ASSAY                              99.0%-100.5%                     99.70%